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简述幼儿集体教学的好处。

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《灵枢·本藏》指出：“经脉者，所以行气血而（），濡筋骨，（）也。”

Which three statements are true about the working of system privileges in a multitenant control database(CDB) that has pluggable databases (PDBs)?（）

A. System privileges apply only to the PDB in which they are used.
B. Local users cannot use local system privileges on the schema of a common user.
C. The granter of system privileges must possess the set container privilege.
D. Common users connected to a PDB can exercise privileges across other PDBs.
E. System privileges with the with grant option container all clause must be granted to a common user before the common user can grant privileges to other users.

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在城市公交客流高峰时段，为了加快车辆周转，车辆在始末站停站时间，不应大于当时行车间隔的（）倍（范围值）。

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企业应制定（）、各类人员的岗位安全生产职责及职责到位标准，并不断改进和完善，建立健全企业的安全生产责任制。

A. 各级
B. 个别
C. 各类
D. 全部

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